Retaining-valve.



No. 865,370. PATENTED SEPT. l0, 1907,.

C. M. FESSLER.

RETAINING VALVE.

APPLICATION FILED KAY 27, 1907.

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CHARLES M. FESSLER, OF SUNBURY, PENNSYLVANIA.

RETAINING-VALVE Specification of Letters Patent.

Patented Sept. 10, 1907.

Application filed May 27,1907. Serial No. 375,912.

To all whom it 'may concern:

Be it known that I, CHARLES M. FEssLEn, a citizen of the United States, residing at Sunbury, in the county of Northumberland and State of Pennsylvania, have invented new and useful Improvements in Retaining- Valves, of which the following is a specification.

This invention relates to air brakes, and is an improvement in automatic retaining valves arranged to hold the full pressure on the brakes of a train while the auxiliary reservoir is being recharged and the releasing does not take place until the full pressure is obtained in the auxiliary reservoir and to which the retaining valve is set.

The invention is especially applicable to the Westinghouse type of air brake and is used to recharge the brake cylinder while the train is going down grade or when there is leakage in the brake cylinder from any cause.

The various features of the invention will be hereinafter more fully described and explained in connection with the accompanying drawing which is a side elevation of the improved valve.

The valve l is connected to the triple valve of an air brake system by the port or connection 2; to the brake cylinder by the port or connection 3; and to the train line by the port or connection 4.

The retaining valve l is provided with a casing or body preferably made in several sections or parts. In the section 5 is a valve 6 Iitting over the stem 7 of the winged valve 8 which has openings or perlorations 9, said valve S acting as a seat for valve 6. On the upper end of stern 7 is a washer l0 which is pressed upon by spring l1 ttin g against the screw plug l2 which is used to regulate the tension of the said spring 1l.

The section 13 of the casing is connected with the train pipe by means ofthe connection or port 4 and contains a piston which is composed of a disk .I4 loosely mounted on a stern and lits against a shoulder l5. Directly under the disk lll is an adjusting washer IG. The stem on which the disk lll is mounted is screwed into the body I7 on the lower side of which presses a spring IS, the said spring 'IS fitting against the upper side of screw plug 19 which is used to regulate the tension of the spring IS. On the upper side of the shoulder l5 is a stem 2O which lits against the lower side of the winged valve S.

The operation of tlie invention is as follows: Air from the triple valve is forced from said valve, by the releasing of the pressure irom the train line, passes through connection 27 ports 9 of winged valve S raises valve 6 and passes through connection 3 into brake cylinder and is stored there during the operation of the brake. The air in brake cylinder is prevented from returning by the valve 6 seated on the winged valve 8. The air cannot be released from said brake cylinder until the increased pressure from the train line and the pressure of the spring I8 acting oir-the piston is greater than the pressure of air in the brake cylinder and the pressure of spring ll on valve 8. The said springs may be adjusted to any desired pressure.

When the increased pressure in the train line is equal to the pressure in the auxiliary reservoir and equal to the pressure set in retainer, the air passes through connection 4 under disk 14 which raises valve 8 and allows the air from brake cylinder to pass under said valve S, through connection 2 to triple valve and through triple valve to the atmosphere. This operation may be performed any number of times and is especially useful when going down grades or when there is a leakage in the brake cylinder from any source.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A retaining valve having triple valve and brake cylinder ports and connections, a valve between said ports, a perforated release valve litting against saidvalve, a spring pressed piston fitting against said release valve for operating the same, and means for admitting` train pipe pressure to said piston,

A retaining valve casing' having the triple valve and brake cylinder-.ports er connections, a valve between said ports 01' connections,normally held in place by the pressure from the brake cylinder, a perforated release valve litting against said valve, a piston iitting against said release valve, and means for admitting train pipe pressure to said piston,

2'.. A retaining valve comprisingl a valve casing having triple valve and-brake cylinder ports or connections, a valve between said ports seated on a perforated release valve, a piston for operating said release valve actuated b v abnormal train line pre..ure, and means for admitting the train line pressure to said piston.

In testimony whereof I allx my signature, in presence of two subscribing witnesses.

CHARLES M. FESSLER.

Witnesses C. F. SHIPMAN, C, W. CLEMENT. 

